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Rainwater harvesting: Sizing and modeling (view source)
Revision as of 20:34, 6 June 2017
, 6 years ago→Rapid
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===Rapid===
===Rapid===
Total cistern volume can be estimated by multiplying the depth of design storm....
<p>Total cistern volume can be estimated by multiplying the depth of design storm the catchment area. 1 mm of rain over 1 m<sup>2</sup> results in 1 L of runoff.
For example, the 90th percentile event in Barrie is 26 mm, so every 1 m<sup>2</sup> of rooftop will generate 26 L during this storm event. A 2000 m<sup>2</sup> building would generate 54,000 L of runoff. </p>
The designers have three choices:-
<ol>
<li>Construct a suitably sized concrete vault underground to capture all of the water</li>
<li>Alter the slope of the roof to create two or more catchments, the smaller catchments may be diverted to plastic or fiberglass cisterns</li>
<li>Design 1. or 2. Slightly undersized for this storm, but with additional capacity in an infiltration system to capture overflow. Examples include [[Bioretention Cells|bioretention cells]] or [[Infiltration Chambers|infiltration chambers]]. </li>
</ol>
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